I am going through fowl pox now (will post pictures). I don't think that's what you're dealing with, but I could be wrong. My bird started out with what looked like a flesh colored abscess
View attachment 1552218 View attachment 1552219 , which grew very large within a few days, then they multiplied quickly. Covering her eyes, beak and feet. They would ooze puss, start to dry, and then new lesions would form. They are just now (8 weeks later) starting to turn dark as they dry up.
Just in case it is something contagious (fowl pox is not curable and is highly contagious), I'd isolate him from the others. If you can get some antibiotics to prevent a secondary infection, that could be helpful.